Case study / Atlantic exposure

Skerryvore

Where is Skerryvore?

Skerryvore lies west of Scotland, among reefs exposed to Atlantic swell. The site is part of the waters around the Inner Hebrides. Its distance from shore, limited landing opportunities and severe wave climate shaped every construction decision.

What did Alan Stevenson design?

Alan Stevenson designed a granite tower with a broad, curved base and a tall shaft. The lower courses were made to grip and follow the reef. Above them, the taper reduced wind pressure and kept the tower’s centre of gravity low. The profile belongs to the same family of wave-resistant masonry as Bell Rock, but the setting imposed its own constraints.

Why does granite matter?

Granite provides hardness and durability, but it is difficult to quarry, transport and dress. Blocks had to be selected, shaped and placed in a sequence that workers could execute on a remote reef. Mortar alone could not be expected to solve movement. Interlocking stone, gravity and geometry had to work together.

How did construction depend on time?

Work on an offshore reef is governed by access. Landing, lifting and setting blocks require a usable sea state and enough daylight. A project can therefore be technically sound yet operationally fragile. Skerryvore records an engineering answer to that fragility: make each course do structural work, keep the plan legible and use the short working periods carefully.

How is Skerryvore different from Bell Rock?

Bell Rock is associated with a reef close enough to the east coast for a different logistical relationship. Skerryvore stands farther into Atlantic conditions. Both use interlocking masonry and a tapered form, but Skerryvore’s scale and exposure make wave action a more dominant design question.

What is the institutional thread?

The Northern Lighthouse Board links Skerryvore to Scotland’s wider system of lights. A tower had to be more than a successful building: it needed a lantern, a recognised character, maintenance arrangements and a place in navigational information. Automation later changed staffing and power systems, but not the need for reliable identification.